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4Towards quantum repeaters
R.A. Akhmedzhanov1, L.A. Gushchin1, A.A. Kalachev2*, I.Z. Latypov2, N.A. Nizov1, V.A. Nizov1, A.V. Shkalikov2, D.A. Sobgaida1, D.A. Turaykhanov2, I.V. Zelensky1
1-A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ul'yanov Street,
Nizhny Novgorod, 603950, Russia 2- Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky str., Kazan, 420111, Russia
One of the most important tasks in the development of quantum technologies is the scaling of quantum networks in order to distribute quantum information over long distances [1]. Solving this problem will make it possible to create a quantum Internet, which is expected to significantly expand the capabilities of quantum communications, quantum computing and quantum measurements.
In this presentation, we discuss the principles of operation of a quantum repeater, a device designed to distribute the entangled states of quantum systems over long distances, which is necessary for operation of future quantum networks. In particular, an overview of the progress in the field of experimental implementation of its simplest version - a first-generation quantum repeater, is presented [1], and our recent experimental results [2-4] devoted to developing a system of compatible narrowband two-photon sources and quantum memories are discussed.
[1] A. Kalachev, Quantum Repeaters: Current Developments and Prospects, Quantum Electronics (in Russian), 53, pp. 609-621, (2023).
[2] R.A. Akhmedzhanov, L.A. Gushchin, A.A. Kalachev, N.A. Nizov, V.A. Nizov, D.A. Sobgayda, I.V. Zelensky, Memory for polarization state of light based on atomic frequency comb in a 153Eu:Y2SiO5 crystal, Laser Physics Letters, 20, 015204, (2023).
[3] D.A. Turaykhanov, I.Z. Latypov, A.V. Shkalikov, A.A. Kalachev, Narrowband entangled photon pair source for a quantum repeater based on solid-state quantum memory, Radiophysics and Quantum Electronics, 67, No 1, (2024).
[4] R.A. Akhmedzhanov, L.A. Gushchin, A.A. Kalachev, N.A. Nizov, V.A. Nizov, D.A. Sobgaida, I.V. Zelensky, Quantum memory in a Eu:YSO crystal for polarization and time-bin qubit states, Radiophysics and Quantum Electronics, 67, No 1, (2024).
